Performance test method of InGaAs near infrared detector for astronomical observation

Based on the evaluation system of astronomical infrared detectors,the performance of two InGaAs NIR detectors,liquid nitrogen-cooled and thermoelectric-cooled,was tested using a modified "photon transfer curve" tests method. The measured value is 83 e(-),which is much higher than the nominal value of 15 e(-);the high and low conversion factors of NIRvana are 1. 25 ADU/e(-) and 0. 097 ADU/e(-),respectively,and the readout noise is 105 e(-) and 380 e(-); the measured value of dark current of NIRvana at the high conversion factor step is 415 e(-)/s,which is about twice of the nominal value. The theoretical estimate of the signal electron number of the Yunnan Observatory two-meter ring telescope at 1. 565 mu m solar magnetic field measurement is about 8800 e(-),and the NIRvana-LN detector signal- to- noise ratio is 70 under the measured dark current of 4. 06 e(-)/s,image exposure time of 20 ms,and readout noise of 83. 59 e(-).